County expert urges 100‑year overland‑flow maps to predict large‑storm paths

Jun 1, 2026

Mike Cook told the council the county's stormwater code does not require 100‑year overland‑flow mapping and recommended adopting such a requirement so officials can identify where excess water will go during extreme storms.

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Mike Cook, invited by Councilman Grodeky, told the council that Jefferson County's current stormwater code (505) does not require developers to map 100‑year overland flow and that omission undermines the county's ability to predict how water will move during unusually large storms.

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